眼窩カラードプラ所見と網膜中心動脈圧との関連

Relation between orbital color Doppler findings and central retinal artery pressure

要約　目的：眼窩カラードプラ所見と網膜中心動脈圧との関連の報告。対象と方法：黒内障発作や眼虚血が疑われた30例60眼を対象とした。男性25例，女性5例で，年齢は46～85歳である。眼窩カラードプラ所見と網膜中心動脈圧を測定した。結果：眼動脈流速と網膜中心動脈圧，網脈中心動脈速度と網膜中心動脈圧には，有意の相関がなかった。眼動脈の逆流速度が14.9cm/秒以上，または網膜中心動脈速度が5.4cm/秒以下で網膜中心動脈圧が55mmHg以下のときに，眼虚血症候群があった。結論：網膜中心動脈圧と眼窩カラードプラ所見とは関連が乏しい。網膜中心動脈圧が55mmHg以下のときに，眼虚血症候群が発症しやすい。

Abstract.　Purpose：To report the relation between orbital color Doppler findings and central retinal artery（CRA）pressure. Cases and Method：This study was made on 60 eyes of 30 patients suspected of blackout or ocular ischemia. The series comprised 25 males and 5 females. The age ranged from 46 to 85 years. Each eye was evaluated for CRA pressure and orbital color Doppler. Findings：No significant relation was present between orbital color Doppler findings and CRA pressure, or between velocity and pressure of CRA. Ocular ischemic syndrome was present in 8 eyes that showed velocity of ophthalmic artery more than 14.9 cm/sec and that showed velocity of CRA less than 5.4 cm/sec with its pressure less than 55 mmHg. Conclusion：Color Doppler findings of the orbit and CRA pressure are poorly correlated and are not interchangeable. Ocular ischemic syndrome is prone to develop when the CRA pressure is less than 55 mmHg.